231131113321230 has 160 divisors (see below), whose sum is σ = 634478795232480. Its totient is φ = 60354540011520.

The previous prime is 231131113321193. The next prime is 231131113321301. The reversal of 231131113321230 is 32123311131132.

231131113321230 is a `hidden beast` number, since 2 + 3 + 1 + 1 + 311 + 1 + 3 + 321 + 23 + 0 = 666.

It is a super-2 number, since 2×231131113321230² (a number of 30 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 231131113321194 and 231131113321203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 2872710 + ... + 21691350.

It is an arithmetic number, because the mean of its divisors is an integer number (3965492470203).

Almost surely, 2^{231131113321230} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231131113321230, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (317239397616240).

231131113321230 is an abundant number, since it is smaller than the sum of its proper divisors (403347681911250).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231131113321230 is a wasteful number, since it uses less digits than its factorization.

231131113321230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18818976 (or 18818967 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

Adding to 231131113321230 its reverse (32123311131132), we get a palindrome (263254424452362).

The spelling of 231131113321230 in words is "two hundred thirty-one trillion, one hundred thirty-one billion, one hundred thirteen million, three hundred twenty-one thousand, two hundred thirty".